Solution
1.Лc1-g1 ! угроза:
2.Лg1-g8 +
2...Сb7-c8
3.Лg8*c8 #
1...Сb7-g2
2.f2-f3 цугцванг.
2...Сg2-f1
3.Лg1-g8 #
2...Сg2-h1
3.Лg1-g8 #
2...Сg2-h3
3.Лg1-g8 +
3...Сh3-c8
4.Лg8*c8 #
2...Сg2*f3
3.Лg1-g8 #
1...Сb7-d5
2.Лg1-d1 цугцванг.
2...Сd5-c4
3.Лd1-d8 #
2...Сd5-a2
3.Лd1-d8 #
2...Сd5-b3
3.Лd1-d8 #
2...Сd5-h1
3.Лd1-d8 #
2...Сd5-g2
3.Лd1-d8 #
2...Сd5-f3
3.Лd1-d8 #
2...Сd5-e4
3.Лd1-d8 #
2...Сd5-g8
3.Лd1-d8 #
2...Сd5-f7
3.Лd1-d8 #
2...Сd5-e6
3.Лd1-d8 +
3...Сe6-c8
4.Лd8*c8 #
2...Сd5-b7
3.Лd1-d8 +
3...Сb7-c8
4.Лd8*c8 #
2...Сd5-c6
3.Лd1-d8 #
1...Сb7-c8
2.Лg1-g7 цугцванг.
2...Сc8-d7
3.Лg7-g8 +
3...Сd7-e8
4.Лg8*e8 #
3...Сd7-c8
4.Лg8*c8 #
2...Сc8-a6
3.Лg7-g8 +
3...Сa6-c8
4.Лg8*c8 #
2...Сc8-b7
3.Лg7-g8 +
3...Сb7-c8
4.Лg8*c8 #
2...Сc8-h3
3.Лg7-g8 +
3...Сh3-c8
4.Лg8*c8 #
3.Лg7-b7 угроза:
4.Лb7-b8 #
2...Сc8-g4
3.Лg7-b7 угроза:
4.Лb7-b8 #
3.Лg7-g8 +
3...Сg4-c8
4.Лg8*c8 #
2...Сc8-f5
3.Лg7-g8 +
3...Сf5-c8
4.Лg8*c8 #
3.Лg7-b7 угроза:
4.Лb7-b8 #
2...Сc8-e6
3.Лg7-b7 угроза:
4.Лb7-b8 #